/Engine/Source/Runtime/SlateCore/Public/Input/HittestGrid.h
Insert custom hit test data for a widget already in the grid
void InsertCustomHitTestPath ( const [SWidget](API\Runtime\SlateCore\Widgets\SWidget) * InWidget, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [ICustomHitTestPath](API\Runtime\SlateCore\Input\ICustomHitTestPath) > & CustomHitTestPath )